This talk about using a thumb drive (basically a bunch of flash memory) to play thousands of songs in your car (or wherever) reminds me of when CD walkmen began to be popular, and CD players in cars were the big deal, and I kept thinking -- there's got to be a way for a completely solid state playing device, with no moving parts whatsoever, to play music. Especially to play this new, digitally encoded music. With no moving parts it would never wear out.
Because I had learned that yes, CD players can wear out, because the lasers have a lifetime. We all knew cassette machines ate tapes. LPs would wear and styluses needed replacing. CDs were supposed to overcome most of that. But the three or four dead CD players in my junk bin are evidence that CD players do have a lifetime.
Then we had an experimental music on hard drive system at work, and I thought it was cool. It was a little clunky, but it worked. But hard drives are mechanisms, and they also can wear out. MOHD was the standard about 2 years after that.
It was a few years after we worked on that clunky MOHD concept when the first portable MP3 players became available. In a way, the MP3 is still the perfect, portable music delivery mechanism. No signal required to capture a stream. No moving parts. All it needs is a battery. Today, with most people, it's probably MP3s or WAVs on their phone. Even an old, outdated smart phone can store a ton of music for portable play.
The advances in tech really have been amazing. My old LPs and cassettes still play -- most of them. I never play them much, though (stereo got ruined over the years), and CDs still play, but the MP3 revolutionized how music is delivered to the consumer. And AFAIK even streaming sites use MP3's, or WAVs.
Sorry for the sidetrack.